<!--父级页面:控制除登录页以外所有页面共有的头部与左侧菜单栏-->
<template>
  <div style="display:flex;">
    <!--  左侧区域  -->
    <div :style="{width:(isCollapse ? '64px' : '208px')}">
      <!-- 左侧菜单栏 -->
      <el-menu
          background-color="#3C82F5"
          style="width:100%;height:100%;min-height:100vh"
          text-color="#fff"
          active-text-color="#ff0"
          :collapse="isCollapse"
          :collapse-transition="false"
          unique-opened router
          @select="selectMenu"
      >
        <!-- 左侧菜单栏中的顶部条 -->
        <el-row :gutter="10" style="padding-top:10px;">
          <el-col :span="2"></el-col>
          <el-col :span="7" style="padding-left:7px;">
            <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse ? 0 : 13">
            <router-link to="/"
                         style="color:#fff;text-decoration:none;font-weight:bold;position:relative;top:8px;left:2px;">
              智慧车辆
            </router-link>
          </el-col>
        </el-row>
        <el-sub-menu index="1">
          <template #title>
            <el-icon style="font-size:21px;">
              <User/>
            </el-icon>
            <span>用户管理</span>
          </template>
          <el-menu-item index="/user">用户列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title>
            <el-icon style="font-size:21px;">
              <Van/>
            </el-icon>
            <span>车辆管理</span>
          </template>
          <el-menu-item index="/vehicle">基本信息</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title>
            <el-icon style="font-size:21px;">
              <Place/>
            </el-icon>
            <span>调度管理</span>
          </template>
          <el-menu-item index="/application">申请列表</el-menu-item>
          <el-menu-item index="/audit">调度审核</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title>
            <el-icon style="font-size:21px;">
              <Location/>
            </el-icon>
            <span>电子围栏</span>
          </template>
          <el-menu-item index="/geofence">围栏管理</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <template #title>
            <el-icon style="font-size:21px;">
              <MessageBox/>
            </el-icon>
            <span>数据字典</span>
          </template>
          <el-menu-item index="/dict">字典管理</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <!--  右侧区域  -->
    <div :style="{width:(isCollapse ? 'calc(100% - 64px)':'calc(100% - 208px)')}">
      <!-- 右侧顶部条菜单栏 -->
      <el-header style="background-color:#fff;padding-top:22px;height:10vh;">
        <!-- 右侧顶部条 折叠图标+退出登录 -->
        <el-row :gutter="10">
          <el-col :span="18">
            <el-icon style="font-size:20px;position:relative;top:3px;" @click="changeCallapse">
              <Expand/>
            </el-icon>
          </el-col>
          <!-- 用户名与退出登录 -->
          <el-col :span="6" style="position:relative;">
            <el-dropdown trigger="click" style="position:absolute;right:20px;">
            <span style="font-size:19px;font-weight:bold;">
              {{ user.username}}
              <el-icon><arrow-down/></el-icon>
            </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout()">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!--  面包屑导航    -->
        <el-breadcrumb separator="/" style="position:relative;top:20px;">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadCrumb">{{item}}</el-breadcrumb-item>
        </el-breadcrumb>
      </el-header>
      <!--右侧下半部分 是可变的主体区域! -->
      <el-main style="padding: 0;min-height:90vh;overflow-y:auto;">
        <router-view/>
      </el-main>
    </div>
  </div>
</template>

<script setup>
import {ref} from "vue";
import UserView from "@/views/user/UserView.vue";

//定义变量用来控制左侧菜单栏是否折叠,默认不折叠
const isCollapse = ref(false);
//定义方法修改折叠状态
const changeCallapse = () => {
  isCollapse.value = !isCollapse.value;
}

//获取登录的用户信息
const user = ref(getUser());
//退出登录功能
const logout = ()=>{
  if (confirm('确定要退出吗?')){
    localStorage.removeItem('user');
    //退出时,面包屑也需要清空!
    localStorage.removeItem('breadCrumb');
    window.location.href = '/login';
    user.value = '';
  }
}
//准备数组维护面包屑数据
let map = {
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','基本信息'],
  '/application': ['调度管理','申请列表'],
  '/audit': ['调度管理','调度审核'],
  '/distribute':['调度管理','车辆分配'],
  '/geofence':['电子围栏','围栏管理'],
  '/dict':['数据字典','字典管理']
};
//定义变量维护当前面包屑的数据
const breadCrumb = ref(JSON.parse(localStorage.getItem('breadCrumb') || '["用户管理", "用户列表"]'));
//选择菜单项时触发
const selectMenu = (index)=>{
  //根据选择的菜单项index,取出map中对应index的值,如['车辆管理','基本信息'],赋值给breadCrumb
  breadCrumb.value = map[index];
  //将值存入localStorage中,防止刷新页面数据丢失
  localStorage.setItem('breadCrumb',JSON.stringify(breadCrumb.value))
};

</script>